Fixing Link to Wrapper Classes and Categorizing

Author: in28minutes

readme.md

@@ -1,31 +1,39 @@
 #Java Topics
- - [Abstract Class](docs/abstract-class.md)
- - [Arrays](docs/arrays.md)
+
+##Basics 
  - [Basics of Objects and Classes](docs/basics-class-object.md)
- - [Collections](docs/collections.md)
- - [Constructors](docs/constructors.md)
+ - [Arrays](docs/arrays.md)
  - [Control Flow - If, Switch, for and while](docs/control-flow-if-switch-for-while)
- - [Enum](docs/enum.md)
- - [Exception Handling](docs/exception-handling.md)
- - [Files](docs/file-io.md)
- - [Generics](docs/generics.md)
- - [Inheritance and Polymorphism](docs/inheritance-and-polymorphism.md)
- - [Initializers](docs/initializers.md)
- - [Inner Classes](docs/inner-class.md)
- - [Interfaces](docs/interfaces.md)
+ - [Operators](docs/operators.md)
+ - [Variables - including initialization](docs/variables-initialization-and-more.md)
+ - [String, String Buffer and String Builder](docs/string-and-string-buffer-builder.md)
+ - [Wrapper classes](docs/wrapper-classes.md)
+
+##Access and Non Access Modifiers
  - [Class Access Modifiers - Default, Public, Private and Protected](docs/modifiers-class-access.md)
  - [Member Access Modifiers](docs/modifiers-members-access.md)
  - [Final Modifier](docs/modifiers-nonaccess-final.md)
  - [Static Modifier](docs/modifiers-nonaccess-static)
+
+##OOPS
  - [Object and its Methods](docs/object-methods.md)
+ - [Inheritance and Polymorphism](docs/inheritance-and-polymorphism.md)
+ - [Abstract Class](docs/abstract-class.md)
+ - [Interfaces](docs/interfaces.md)
+ - [Constructors](docs/constructors.md)
  - [More about OOPS](docs/oops-advanced.md)
- - [Operators](docs/operators.md)
+ - [Inner Classes](docs/inner-class.md)
+ 
+##Advanced Stuff
+ - [Collections](docs/collections.md)
+ - [Initializers](docs/initializers.md)
+ - [Enum](docs/enum.md)
+ - [Exception Handling](docs/exception-handling.md)
+ - [Files](docs/file-io.md)
+ - [Generics](docs/generics.md)
+ - [Variable Arguments](docs/variable-arguments.md)
  - [Assert](docs/others-assert.md)
  - [Date and Calendar](docs/others-date-calendar.md)
- - [Others](docs/others.md)
  - [Serialization](docs/serialization.md)
- - [String, String Buffer and String Builder](docs/string-and-string-buffer-builder.md)
  - [Threads and Synchronization](docs/threads-and-synchronization.md)
- - [Variable Arguments](docs/variable-arguments.md)
- - [Variables - including initialization](docs/variables-initialization-and-more.md)
- - [Wrapper classes](wrapper-classes.md)
+ - [Others](docs/others.md)